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Finding the Fourth Proportional to 784.55, 1,082.40 and 489.57

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Solution

The fourth proportional to 784.55, 1,082.40 and 489.57 is: 675.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.55 : 1,082.40 = 489.57 : x
  2. Step 2: Convert to fraction form
    784.55/1,082.40 = 489.57/x
  3. Step 3: Cross multiply
    784.55x = 1,082.40 × 489.57
  4. Step 4: Simplify right side
    784.55x = 529,910.57
  5. Step 5: Solve for x
    x = 529,910.57/784.55
  6. Step 6: Final answer
    x = 675.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.